Above is the schematic I simulate in LTSpice. The input signal is a 8V pulse train with 100us ON time and 2250us period. The signal is fed as an input to the timer 555(NE555 in LTSPice).
I'm trying to stretch ON time to around 600us. So according to math R1 = 560 ohm and C1 = 1uF for this ON time.
But when I simulate in LTSpice whatever the R C combination is the output is the same: goes on with input's falling edges and goes off with input's rising edges.
Am I doing something wrong here?